Mold for forming artificial teeth.



No. 78,330. Patented Nov. II, 1902. M. J. MURRAY.

MOLD FOR FORMING ARTIFICIAL TEETH.

(Application filed Dec. 5, 1901.)

(No Model.)

i F .70 F .11. ,F' .12. w mm UNTTED STATES PATENT OFFICE.

MICHAEL J. MURRAY, OF NE\V YORK, N. Y., ASSIGNOR TO CONSOLIDATED DENTAL MANUFACTURING COMPANY, OF NFWV YORK, N. Y., A CORPO- RATION OF NEXV YORK.

MOLD FOR FORMING ARTIFICIAL TEETH.

SPECIFICATION forming part of Letters Patent No. 713,330, dated November 11, 1902.

Application filed December 5,1901. Serial No. 84,736. (No model.)

the tooth-blank as it comes from the mold.

To (all whom it may concern:

Be it known that I, ll/IICHAEL J. MURRAY, Fig. 7 is a vertical central section from front a citizen of the United States, and a resident to rear therethrough. Fig. 8 is a top plan of the borough of Manhattan, in the city and view of the same; and Figs. 9,10, 11, and 12 State of New York, have invented a new and represent the completed tooth in back elevauseful Improvement in Molds for Forming tion, side elevation, central vertical section, 55

Artificial Teeth, of which the following is a and top plan, respectively.

specification. The mold for forming the tooth-blanks The object of my invention is to provide an comprises two sections 1 and 2, which when improvement in a mold for forming artificial united will form a series of completed matteeth in which the matrix is so formed as to rices, one portion 3 of each matrix being lo- 60 produce a groove leading from the exterior of cated in the section 1 and the other portion 4 the tooth to the face of the combustible core of the said matrix being located in the sectherein after the tooth has been molded into tion 2 of the mold.

15 shapein the mold, so that when the combus- The different matrices in the mold are tible core is consumed during the firing comshaped to form the different teeth in a set, 65

munication with the cavity within the tooth as is usual. The section 1 of the mold is pro is established with the exterior along one side vided with the usual two removable pieces 5 of the said cavity. and 6, with the intermediate locking-key '7 A further object is to provide a mold of the for facilitating the removal of the tooth-blank above character in which the combustible after it has been dried. The combustible 70 core is formed of such shape that when it is core for forming a dovetailed recess in the consumed during the firing of the tooth a tooth is denoted by 8 and is made of some dovetailed cavity will be formed in the tooth suitable materialsuch, for instance, as

for permitting the tooth to be anchored to wood.

the artificial gum without the use of platinum By the use of the term combustible I 75 pins, as has hitherto been usual. intend to embrace any substance which will A practical embodiment of my invention is retain its shape within the tooth-blank unrepresented in the accompanying drawings, der the relatively low temperatures used in in whichmolding and drying the same, but which will Figure 1 represents a face view of a porbe caused to vanish when the blank is sub- 80 tion of one section of a mold for forming artijected to the high temperatures used for firficial teeth, the conical cores of combustible ing the same to complete the teeth. The core material being shown held in position upon is shown of hollow conical form and is retheir supportingpins within two of their matmovably secured upon the inner end 9 of a rices, the next two matrices showing the recore-supporting pin 10, which extends in- 85 movable pins in position without the cores wardly through the mold-section 1 into the therein and the remaining matrices having interior of the matrix 3 therein. the pins removed therefrom. Fig. 2 is a face A projecting rib 11 is formed in the bottom View of a portion of the other section of the of the matrix 3 in position to engage one wall mold shown in Fig. 1. Fig. 3 is a transverse of the combustible core 8 from its base to its 0 vertical section through the mold in the plane top, so as to form a groove 13, connecting the of the line A A of Fig. 1, one of the completed dovetailed recess 12, formed by the core, with matrices being filled with the body composithe exterior of the tooth for facilitating the tion of the tooth to show the method of emattachment of the tooth to its artificial gum bedding the combustible core therein. Fig. by providing an air-vent for permitting the 5 4 is a side View of the tooth-blank as it comes escape of the air within the recess as the mafrom the mold. Fig. 5 is a side view of the terial which forms the artificial gum is forced combustible core. Fig. 6 is a back view of into thesaid recess.

In operation the core-supporting pin is inserted through the section 1 of the mold until its end 9 projects into the matrix 3. One of the combustible cores 8 is then inserted into position upon the end 9 of the said supporting-pin, the core being thus held in position within the matrix. The matrices 3 and 4, which together form a completed tooth,

two sections 1 and2 of the mold are removed from engagement with each other. The key 7 and the pieces 5 and 6 are then removed to permit the tooth-blank to be withdrawn from the mold. The tooth-blank, with its core therein, is then inserted into the firing-furnace in the usual manner and left there for the required time to completely fire the tooth. The combustible core 8 is consumed during the firing process, thus leaving the dovetailed recess 12 therein, together with the groove 13, leading from one side of the recess to the exterior of the tooth.

It is evident that changes mightbe resorted to in the construction, form, and arrangement of the several parts Without departing from the spirit and scope of my invention. Hence I do not Wish to limit myself strictly to the structure herein set forth; but

What I claim is 1. A mold having a matrix for forming an artificial-tooth blank therein, a core-supporting pin extending into the matrix and a tapered combustible core seated on the coresupport within the matrix for forming a dovetailed recess in the tooth-blank open through the wall of the blank, substantially as set forth.

2. A mold having a matrix for forming an artificial-tooth blank therein, a core for forming a recess in the tooth-blank and a support for the core, the said matrix having a rib in engagement with the core for forming a ventgroove leading from the said recess to the exterior of the tooth-blank, substantially as set forth.

3. A mold having a matrix for forming an artificial-tooth blank therein, a tapered core for forming a dovetailed recess in the toothblank open through the wall of the blank, and a support for the core, the said matrix having a rib in engagement With one face of the tapered core for forming a vent-groove leading from the said recess to the exterior of the tooth-blank, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two Witnesses, this th day of November, 1901.

MICHAEL J. MURRAY. Witnesses:

FREDK. HAYNES, G. S. SUNDGREN. 

